Butyramidine

ABSTRACT

NEW DERIVATIVES AND ANALOGUES OF BUTYRAMIDINE HAVING THE GENERAL FORMULA:   A-O-CH2-CH(-OH)-CH2-C(=N-R1)-N(-R2)-R3   IN WHICH A REPRESENTS A-NAPHTHYL OR B-NAPHTHYL, R3 REPRESENTS A HYDROGEN ATOM OR A LOWER ALKYL GROUP HAVING 1 TO 3 CARBON ATOMS, R2 REPRESENTS A HYDROGEN ATOM, A HYDROXYL GROUP OR A LOWER ALKYL GROUP HAVING 1 TO 3 CARBON ATOMS, AND R1 REPRESENTS A HYDROGEN ATOM, R1 AND R2 CONSIDERED TOGETHER BEING CAPABLE OF FORMING WITH THE TWO NITROGEN ATOMS AND THE CARBON ATOM OF THE AMIDINE FUNCTION OF 2-IMIDAZOLINYL OR 1,4,5,6-TETRAHYDRO-2-PYRIMIDINYL RADICAL WHEN R3 IS A HYDROGEN ATOM. THE COMPOUNDS OF FORMULA I AND THE NON-TOXIC ACID ADDITION SALTS THEREOF ARE ACTIVE B-BLOCKING AGENTS AND ARE USED IN THE TREATMENT OF CARDIAC TROUBLES.

United' states Patent 1 zfice 3,819,702 BUTYRAMIDINE Victor Lafon, Paris, France, assignor to Societe anonyme dite: Orsymonde, Paris, France No Drawing. Filed June 18, 1971, Ser. No. 154,679 Claims priority, appligzgzrsfrauce, June 29, 1970,

Int. Cl. C07c 123/00 US. Cl. 260-564 G Claims ABSTRACT OF THE DISCLOSURE New derivatives and analogous of butyramidine having the general formula:

in which A represents ot-naphthyl or ,B-naphthyl, R represents a hydrogen atom or a lower alkyl group having 1 to 3 carbon atoms, R represents a hydrogen atom, a hydroxyl group or a lower alkyl group having 1 to 3 carbon atoms, and R represents a hydrogen atom, \R, and IR considered together being capable of forming with the two nitrogen atoms and the carbon atom of the amidine function of 2-imidazolinyl or 1,4,5,6-tetrahydro-2-pyrimidinyl radical when R is a hydrogen atom.

The compounds of Formula I and the non-toxic acid addition salts thereof are active ii-blocking agents and are used in the treatment of cardiac troubles.

The present invention relates -to new derivatives and analogues of butyramidine as well as their acid addition salts. These derivatives and analogues correspond to the general formula:

in which A represents u-naphthyl or B-naphthyl, R represents a hydrogen atom or a lower alkyl group having 1 to 3 carbon atoms, R represents a hydrogen atom, a hydroxyl group or a lower alkyl group having 1 to 3 carbon atoms, and R represents a hydrogen atom, R and [R considered together being capable of forming with the two nitrogen atoms and the carbon atom of the amidine function a Z-imidazolinyl or 1,4,5,6-tetrahydro-2-pyrimidinyl radical when R, is a hydrogen atom.

By derivatives of butyramidine is meant the aand ,B-naphthyl-4-oxy-3-hydroxy butyramidines, monoor disubstituted on one of the nitrogen atoms of the amidine group; by analogue is meant the cyclic amidines, the lateral chain becoming in this case a 3-u-naphthoxy 2- hydroxy propyl chain.

T he invention equally concerns pharmaceutical compositions including, in association with a physiologicallyaccep-table vehicle, at least one compound of Formula I or one of the non-toxic acid addition salts as an active B-blocking ingredient. The pharmaceutical compositions according to the invention, are used particularly in the treatment of cardiac troubles.

The invention equally relates to a process for the preparation of the compounds of formula I from ocor B- naphthol. According to this process, after having condensed the naphthol on epichlorhydrin in the presence of Patented June 25, 1974 caustic soda and treated the 3-naphthyloxy-1,2-epoxy propane with hydrochloric acid gas:

(a) the l-chloro-3-naphthyloxy-2-propanol is reacted with potassium cyanide in an anhydrous solvent at the reflux temperature of the said solvent;

(b) the naphthyloxybutyronitrile obtained is condensed with ethanol in an anhydrous medium, and

(c) the imino-ethyl-ether thus obtained is condensed with an amine of the formula:

in which R and R are identical or different and each represents a hydrogen atom or a lower alkyl group having 1 to 3 carbon atoms, the compound of formula I in which R R =JR =H being capable of reacting with hydroxylamine, ethylenediamine and propylenediamine to give respectively 4-naphthyloxy 3-hydroxy butyramidoxime, 2-(S-naphthyloxy Z-hydroxy propyl)- imidazoline, and 2-'(3-naph-thyloxy-2-hydroxy propyl)- 'l,4,5,6-tetrahydro pyrimidine, and wherein the compounds of formula I are capable of being transformed into acid addition salts.

The acid addition salts which are suitable according to the invention are those obtained from pharmaceutically acceptable acids, for example, mineral acids, such as hydrochloric, hydrobromic, hydroiodic, sulphuric and phosphoric acids, and from organic acids, such as oxalic, fumaric, maleic, citric, ascorbic, cyclohexylsulphamic and benzoic acids.

According to one feature of the invention butyramidine hydrochlorides of formula I are obtained at the end of the process by efiecting the above described condensation (b) under a current of hydrochloric acid gas and then treating the imino-ethyl-ether hydrochloride by the amine HNR R according to the above reaction (0).

Other advantages and essential features of the invention will be better understood from the description of the following non-limitative Examples:

EXAMPLE 1 4-a-naphthyloxy-3-hydroxy-butyramidine hydrochloride ,HCl

on NH;

9.3 g. (0.1 mol) of epichlorhydrin in 20 ml. of ethanol were added to a solution of 15 g. (0.1 mol) of tit-naphthol and 4 g. (0.1 mol) of caustic soda in'50 ml. of water. The mixture was heated for 5 mins. at boiling point. After evaporation of the ethanol and cooling, 3-a-naphthyloxy- 1,2-epoxy propane formed in ethyl ether was extracted. This ethereal solution, was rinsed in water and then dried in anhydrous sodium sulphate and saturated by a current of dry hydrochloric acid gas. After 48 hours, it was rinsed with water, then with a diluted solution of sodium carbonate and finally with water again. After drying in anhydrous sodium sulphate and evaporation of the ethyl ether, 23.1 g. (yield 97%) of crude 3-m-naphthyloxy-1- chloro-2-propanol were obtained.

A solution of 7.1 g. (0.11 mol) of potassium cyanide in 30 m1. of water was added to this product (0.097 mol) dissolved in 120 m1. of ethanol. The mixture was heated at boiling point under reflux of the solvent for 1 hour. After evaporation under vacuum of the solvent and cooling, ethyl ether was added. The ethereal solution was rinsed in water, dried in anhydrous sodium sulphate and then evaporated. 20 g. (yield of crude 4-a-naphthyloxy-3-hydroxy butyronitrile were obtained.

The solution of this product (0.088 mol) in ml. of ethanol and 150 ml. of ethyl ether was saturated in the cold state by a current of hydrochloric acid gas. The mixture was then placed in a refrigerator for one night. 150 ml. of ethyl ether were added and 20 g. (yield 74%) crude 4-a-naphthyloxy-3-hydroxy-butyroimino-ethyl ether hydrochloride were obtained.

The solution of this product (0.065 mol) in 200 ml. of ethanol was saturated by a current of dry ammonia. After one night in a refrigerator, 200 ml. of ether was added and filtered off. The crude 4-a-naphthyloxy 3 hydroxy butyramidine hydrochloride, thus isolated, was purified by crystallisation in methanol.

The product was obtained in a total yield of 57% in the form of a white micro-crystalline powder (instantaneous melting point: 203 C.), soluble in water, slightly soluble in methanol and ethanol and insoluble in ethyl ether and acetone.

.The following shows the reactions which occurs in the synthesis according to Example 1.

+ C1 CH CH CH NaOH 1101 O-CHz-CH-CHz-CN ether OH HCl OCzHs 4-a-naphthyloxy-Ii-hydroxy-butyramidoxime hydrochloride HCl 56.2 g. (0.2 mol) of 4-u-naphthyloxy-3-hydroxybutyramidine hydrochloride prepared according to Example 1 were added to a solution of hydroxylamine in 300 ml. of methanol prepared from 21 g. (0.3 mol) of hydroxylamine hydrochloride and sodium methylate. After 1 hour of agitation, the mixture was left at the ambient temperature for 24 hours.

The evaporation under vacuum of the solvent left a residue which was recovered in water and ethyl ether. The ethereal solution was dried in anhydrous sodium sulphate, then evaporated resulting in 4-a-naphthyloxy-3-hydroxyl butyramidoxime base. By adding hydrochloric ethanol, the hydrochloride was obtained which was isolated after precipitation in ethyl ether. It was purified by crystallisation in an ethyl ether/methanol mixture.

This product was obtained in a yield of 74% in the form of a white crystalline powder (instantaneous melting point: 188 C.), soluble in water, methanol, ethanol and insoluble in ethyl ether.

EXAMPLE 3 2-(3a-naphthyloxy-2-hydroxy-propyl)-imidazoline hydrochloride 5.6 g. (0.02 mol) of 4-a-naphthyloxy-3-hydroxy-butyramidine hydrochloride prepared according to Example 1, 30 ml. of ethanol and 2 ml. of ethylenediamine were introduced into a balloon flask. The mixture was heated to the boiling point of the solvent and reflux was maintained for 4 hours.

The ethanol was evaporated under vacuum and the residue treated with ethyl ether.

The crude hydrochloride thus isolated, was purified by crystallisation in methanol.

The product was obtained in a yield of 79% in the form of fine White crystals (instantaneous melting point 220 to 222 C.), soluble in Water, slightly soluble in methanol and ethanol and insoluble in ether and acetone.

By proceeding according to Example 3, but replacing the ethylene diamine by propylenediamine, 2-(3-a-naphthyloxy-Z-hydroxy-propyl)-1,4,5,6 tetrahydro-pyrimidine hydrochloride was obtained.

EXAMPLE 4 4-a-naphthyloxy-3-hydroxy-N,N-dimethyl-butyramidine hydrochloride 6.2 g. (0.02 mol) of 4-ot-naphthyloxy-3-hydroxy-butyroimino-ethyl ether hydrochloride, prepared according to Example 1, 20 ml. ethanol and 13.2 ml. (0.09 mol) of dimethylamine in alcoholic solution at 330 g./1. was added to a balloon flask.

The mixture was brought to boiling point and then maintained for 3 hours under reflux.

The alcohol was then removed under vacuum. The residue was recovered in water. The aqueous solution was rinsed in ethyl ether and filtered through carbon, and then evaporated under vacuum.

The crude 4 a-naphthyloxy-3-hydroxy-N,N-dimethylbutyramidine hydrochloride thus isolated was purified by crystallisation in a methanol/ethyl acetate mixture.

The product was obtained in a yield of 73% in the form of white flakes (instantaneous melting point: 152 C.), soluble in water, methanol and ethanol and insoluble in ether, benzene and ethyl acetate.

EXAMPLE 5 (Comparative) 4-ot-naphthyloxy-3-hydroxy-butyrohydroxamic acid 20 g. (0.065 mol) of 4-wnaphthyloxy-3-hydroxybutyroimino-ethyl ether hydrochloride, prepared according to Example 1, and 200 ml. of water were introduced into a balloon flask and were brought to boiling point. After cooling, the aqueous solution was extracted with ethyl ether.

The ethereal phase was rinsed with an aqueous solution of sodium bicarbonate, then water and dried on anhydrous sodium sulphate. After evaporation under vacuum of the ethyl ether, crude 4 a-naphthyloxy-3-hydroxyethyl butyrate was obtained.

7.7 g. (0.11 mol) of hydroxylamine hydrochloride and 6 g. (0.11 mol) of sodium methylate were added to this product which was solubilised in 250 ml. of methanol. It was left for 24 hours at the ambient temperature. The methanol was then evaporated under vacuum and the residue recovered in water. After acidification, the 4-a-naphthyloxy-3-hydroxybutyrohydroxamic acid was isolated by filtration and rinsed in ethyl ether. It was purified by crystallisation in ethanol.

The product was obtained in a yield of 82% in the form of creamy White flakes (instantaneous melting point: 171 C.), soluble in methanol, slightly soluble in cold ethanol and insoluble in ether and water (less than 1 g./l.). It was prepared to show the importance of the C=NH bond with regard to cardiovascular activity.

The products of Examples 1 to 5 have been subjected to pharmacological experiments.

EXAMPLE 6 (a) 4-}9-naphthyloxy3-hydroxy butyronitrile A solution of 28.8 g. (0.2 mol) of B-naphthol, 8 g. (0.2 mol) of caustic soda in pastilles and 18.6 g. (0.2 mol) of epichlorhydrin in 200 ml. of water were heated for 10 mins. at boiling point, left to cool and then extracted with 200 ml. ether, washed in water and dried on sodium sulphate and finally filtered.

The filtrate was saturated with hydrochloric acid gas up to absorption of 10 g. (0.27 mol), left for 48 hours at C., washed with water, then with dilute sodium bi- 4 carbonate, dried and finally the ether was evaporated off under vacuum. 200 ml. of ethanol and a solution of 13 g.

(0.2 mol) of potassium cyanide in ml. of water were added to the residue.

The treated residue was heated for 2 hours at boiling point, dried and washed in water and then recrystallised to produce 4-j3-naphthoxy-3-hydroxy butyronitrile with a yield of 72% and having a melting point of 142 C.

(b) 4-,B-naphthyloxy-3-hydroxy-butyramidine hydrochloride NH O-CH2-CH-CHz-C H01 H NH2 EXAMPLE 7 4-fi-naphthyloxy-3-hydroxy-butyramidoxime hydrochloride A solution of hydroxylamine was prepared by adding 4.1 g. (0.075 mol) of sodium methylate to 5.25 g. (0.075 mol) of hydroxylamine hydrochloride in solution in 250 ml. methanol, and then stirred for a half-hour and the NaCl then filtered off.

14 g. (0.05 mol) of 4fi-naphthoxy-3-hydroxy-butyramidine was added to this solution which was then left for one night. The methanol was then evaporated off under vacuum, 100 ml. of water was added and the solution was then evaporated, washed in water, dried and recrystallised in ethyl acetate.

The hydrochloride was obtained by adding hydrochloric ethanol base to the ethereal suspension up to a pH 1. It was then evaporated and recrystallised in an ethanol-ether mixture.

4 ,B-naphthoxy-3-hydroxy-butyramidoxime hydrochloride was obtained with a total yield of 62% in the form of a white powder soluble in water, ethanol, methanol and insoluble in ether and benzene.

The product of Example 1 has a DL-50 by intravenous means in mice of 27.5 mg./ kg. The ocular, intravenous and intra-muscular tolerance was studied in rabbits, dogs and rats. The results relating to such tolerances are listed in Table I.

The product of Example 1 exerted a B-blocking effect on an isolated guinea pig auricle with a dose of 1.4 mcg./ml., that is to say with the same dose as the propanol in our experiments. It had a coronary dilatating effect on an isolated rabbit heart. The product by I.V. and I.M. injection produced fleeting hypotension in an anaesthetized rabbit. By I.M. injection in rats, it exerted variable effects according to the animals.

The preparation perfused intravenously in dogs with a dose of 2.75 mg./kg. caused a fall in the intraventricular pressure, a drop in the cardiac frequency with extension of the ejection time, and an increase in heart beat. These effects are favourable to an anti-anginous action.

The toxicity of the product of Example 2 was studied in mice. By I.V. injection, the dose of DL-SO was 180 mg./kg. and orally, was 1000 mg./ kg.

In anaesthetised dogs, the product of Example 2 exerted an anti-anginous activity by ID. means in doses of 36 and mg./kg. It is less active by I.M. injection with a dose of 60 mg./kg.

In normally tensioned or hypotensioned rats, the product administered intramuscularly and orally did not exert any hypotensive effect.

An oral dose of 310 mg./kg. had analgesic properties of the morphine type.

The product administered intravenously to rats caused hypotension of long duration but was non-ganglioplegic.

With a DL-SO of 59 mg./kg. of the product of Example 3 administered to mice intravenously, the following symptoms were observed: convulsions then sedation, polypnea and death 'by respiratory arrest.

The animals which had received 30 rug/kg. I.M. of the product had practically no symptoms, except torsion of the body.

To show the cardiovascular properties, the B-blocking properties were studied on an isolated guinea pig auricle. With a dose of 0.1 ,ug./ ml. the product exerted no action on the isolated auricle, it twice reduced (66%, 29%) for 3 to 30 mins. and once increased for more than 15 mins., the positive inotropic action of the isoprenaline.

7 8 With a dose of 1 g./ ml. it did not exert any action on Regarding the therapeutic use, it is preferable to specify the isolated auricle, it twice reduced (100%, l8%) that the pharmaceutical composition which is administered from 3 to more than 50 mins. and once increased includes at the most 90% b.w. of a compound of For- (+11l%) the positive inotropic action of the isoprenamula I or one of its non-toxic acid addition salts as the line. active ingredient. The active ingredient is associated with The product of Example 4 had a DL-SO of 25 mg./ kg. a physiologically-acceptable vehicle known in itself to when administered intravenously in mice. The following give a medicine which can be administered by injection,

symptoms were observed: polypnea, hematuria. Death, oral or rectal means and by perfusion.

when it arrived, was immediate. The mice which had Each injection dose should comprise 5 to 25 mg. of

received a dose of 12.5 ,ug./kg. by LM. injection showed the active ingredient in solution in 2 ml. of isotonic solutorsion of the body, the mortality being increasable by tion of 9 g./l. Capsules, tablets or cachets may be used electric shock. In order to show the ii-blocking properties, for oral doses, each preferably containing 125 to 150 mg.

an isolated guinea pig auricle was used. The fl-blocking of the active ingredient.

action only appeared at 10 meg/ml. and Was fleeting The products of Examples 1 to 4 have been adminis- 5 m), tered successfully to humans in the treatment of arythmia For the coronary dilatory properties, experiments were in the form of injectable phials containing 5 mg. in 2 carried out on anaesthetised dogs; the product was adml. of NaCl solution of 9 g./l.

ministered intravenously with a dose of 2.5 mg./kg. in The products of Examples 2 and 3 have given good two dogs. The following occurrences were observed: results in cardiac troubles, with arythmia. They have been administered in the form of measured capsules, tablets and cachets of 125 mg. and in the form of injectable phials of mg. in isotonic sodium chloride solution.

The derivatives of Examples -6(b) and 7 are active for the treatment of arythmia in humans, with the dose of 25 150 mg. per dose (capsules or tablets) three to four a fall in blood pressure (22% a reduction in the left intraventricular pressure (-42% an extension of the time of ejection (23%) accompanied by a moderate bradycardia.

The output of the coronary sinus, the coronary arterial and venous P0 were not modified. times a day.

TABLE I Number of animals Composition used Dose Administration Tolerance 2 rabbits Solution of 10 g./l. in physiological 3 times two drops 2 drops every mins.in the eye, or Average-lrritatiori from th serum. or mg. 1 mg. every 30 mins. 4th drop.

1 ml. per rabbit"... Dn d0 2 LV. Good.

2 dogs do }I. Mediocre-Salivation, polypn a,

diarrhea, sedation. 5 rats Phial of 5mg. 01' active principle in 5 }I.M Good.

m1. of injcctable solute. 5 mgJkg 1st dog: Phial of 5 mg. per 5 ml. of 5 mg./dog 2 do 5 solute. I V

g 2d dog: Solution of 63 g./l. 1n physi- 3mg.lkg Do;

ological serum.

The observed occurrences are in the sense of a fl-block- I claim: ing type antianginous action but are not dilatory. 1. A compound of the formula:

The toxicity of the product of Example 5 was tested NH on mice by means of oral doses of up to 2 g./kg. No effect H was observed. In other respects, the animals treated did AO"CH2GH CHPCNHOH not show any symptoms. H

Observation of the mice whlch had recon/Ed wherein A is a-naphthyl or p-naphthyl, or a salt thereof by gastric means showed an increase in lacrymation and with a pharmaceuticany acceptable acid yp y 2. The compound of claim 1 which is 4-(a-naphthy1- Regarding cardiovascular activities, experiments were 3 hydroxybutyra.midoxime hydrochloride.

carried out on isolated rabbit hearts. On two rabbit The Com ound of claim 1 which is hth hearts perfused with Van Dick Hastings liquid without oxy) 3 hydroxgbutyramidoxhne hydrochloridif nap y BaCl the product of Example 5, with a dose of 10 mcg./ 4 (0c naphthyloxy) 3 hydroxybutyramidoxime or a expeflment) l'ncreased h coronary Output PY salt thereof with a pharmacentically acceptable acid. 20%, exerted a negative inotropic effect of 28%, did 5 4-(p na hthyloxy)-3-hydroxybutyramidoxime or a not alter the rhythm, and with a dose of 100 meg/ml. Salt thereof with a h m 11 (two experiments) it reduced the coronary output by P ar 163 y acceptable acid.

55%, exerted a negative inotropic effect of 24 to 50% References Ci and did not alter the rhythm of the ventricular beats.

The product administered to four rats in an oral dose (dlchlan Orgamc Synthesls 1282-84 of 1 g./kg. did not exert any effect on the blood pressure Morrison et a1 Organic chemistry p 23 (1962) during the 6 hours of observation.

Smith, Open Chain Nitrogen Compounds, vol. I, p The product in doses of 0.1 to 100 meg/ml. did not 177, 183 and 220 (1965)- P exert any eifect on an isolated guinea pig auricle. With the same doses, neither the inotro ic action nor the chronotropic action of isoprenaline v v ere modified. LEON ZITVER Pnmary Examiner The product of Example 5 is devoid of cardiovascular SCHWARTZ, Assistant Examiner action; its lack of action shows the importance of the C=NH or C=NR bond of the amidine group. This bond must be present if activity in the products of the 260251 R, 309.6, 343.7, 348.6, 453 R, 465 F 5005 H present series is desired. 501.12, 501.14, 564 R, 613 D; 424-251, 273, 316, 326 

